When you logoff from the desktop, your computer will have a lock screen with a background image. You can change this image and set one from local hard drive, as you wish.
The lock screen looks like this. We will change this background.
1 Open Charms
Press Windows + C keys, to open the Charms menu.
Then click on Settings (bottom-right corner).
3 Change PC Settings
Click on this option.
4 Lock Screen
Click on the big image with your current background image for the lock screen.
5 Choose a new image
Select another image.
If you click Browse, you can select an image from local hard drive.
Also, you can play a slideshow and the pictures will rotate on your lock screen.
6 View the result
Press Windows + L to logoff.
The new background is in its place.